I worry about you guys sometimes. I have lenses I must have changed thousands of times and there is no discernible wear.
'Excessive wear on the mounts'?? Even the plastic bayonet mounts on (relatively) low cost lenses are pretty durable, although they'll wear eventually. The metal bayonet mounts of bodies and most lenses will not wear appreciably even with many years of heavy use.
Oh really? Ok, so lens mounts on Canon cameras and their lenses, are the only things in existence that do not wear when they come in contact with each other. That's nice to know. I'm glad people worry about me, I feel so loved.
Don't be so silly it has got nothing to do with loving, or not, you as a person, it is about erroneous information put out because of speculation, theory, irrationality, bad teaching etc.
The lenses are designed to go on and off. Mechanical wear is brought on by friction and the heat that causes, there is no heat generated in a 60° rotation and the friction is supplied via a spring specifically put there to do that job. Of course there is a microscopic amount of wear, but it is so minimal the lenses I have mounted thousands, if not tens of thousands of times show none and that is an empirical observation.
I remember when Canon moved the FD mount to the FDn mount, everybody said twisting the lens was a terrible idea and we'd get wear in no time, turns out that wasn't true either, and I do have fd lenses I have mounted tens of thousands of times.
But you said you worried about me. Sorry just taking you at your word, I'll try to remember to not do that in the future.
It's good to know you have observed no wear after changing lenses thousands of times on the same body. I don't plan on doing that, myself, nor do I have the need to. And it's good to know that I can't trust my lying eyes, after seeing the wear I saw on the 1D4 I mentioned, that I rented. I feel more relaxed now, because I know that camera and lens mounts, are a good case where metal on metal contact, causes no wear. If the automakers could only learn this, we could drive our cars with no oil in the engine.